“They are devastated by their loss and they are currently being supported by specialist police officers during this difficult time.

Police have appealed for information about the crash (Joe Giddens/PA)

“Extensive police inquiries are ongoing and I can confirm that the driver of a white van has now responded to the initial witness appeal.

“The driver was able to provide significant information and has since been eliminated from our inquiry.

“However, it is absolutely vital that we speak to everyone who was travelling south on the A9 between the roundabout at Inveralmond and the roundabout at Broxden about 2.15am on Sunday 4 November.

“We need to speak to anyone who saw Doreen walking along the A9 or on nearby Dunkeld Road or who saw an HGV lorry stopped on the nearside lane of the southbound carriageway with its hazard warning lights illuminated.

“We know that several vehicles passed both the incident and the HGV. I urge these drivers to come forward now.

“Doreen’s family need the help of the public to find the answer to what happened to their mother.”

Anyone who witnessed the incident, drove past it or has dashcam footage is asked to call Police Scotland on 101 quoting reference number 0672 of November 4 or speak to any police officer.

Alternatively they can call Crimestoppers on 0800 555 111 where information can be given anonymously.